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Nautilus
Owned to the family of the Nautilidae, the nautilus is defined the "living fossil". Some of these fossils have been dated to the Cambrian period when life in the seas was very developed. believed that it was an extinct marine animal but in 1829 it was discovered for the first time and studied.
Currently the most abundant species is the Nautilus Pompilius which lives near coral reefs. The characteristic element of this fossil and modern cephalopod, is given by its spiral shell. The inside part has chambers of increasing size separated from each other by septa but connected by the siphon.
The last chamber, the most external one, is the houses of animal's body. The nautilus has the ability to re-fill or empty the chambers of the shell from gases and liquids. This allows him to move within the sea reaching even depth of 500 meters.